Gunstar

Gunstar
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Pattern type	Gun
Number of cells	736
Bounding box	149 × 149
Period	144
Barrels	4
Discovered by	David Buckingham
Year of discovery	1990
Rules Outer-totalistic rules B3/S23 – B38/S23 # of rules 21 = 2 Isotropic rules B3/S23 – B38/S234c6i
Pattern files Plaintext gunstar.cells RLE gunstar.rle

A gunstar is any of a series of four-barrelled glider guns of period 144 + 72n (n ≥ 0) that were constructed by David Buckingham in 1990 based on his transparent block reaction and Robert Wainwright's period-72 oscillator two blockers hassling R-pentomino. Two copies of the oscillator together with a blocker and two eater 1s can duplicate a glider. One output glider emerges in the same direction as the original; the other is turned 90 degrees. A 4-barrelled gun can be constructed by putting together 4 such reflectors.

Below are shown the "first" such gun, with a period of 144, and the next such gun, with a period of 216.

x = 265, y = 265, rule = B3/S23 65bo$64b2o$64bobo34$101bo$100b2o$100bobo20$98b2o$98b2o$98b2o$98bo$97bo bo$97bob2o$262b2o$104b2o157b2o$98b2o4b2o156bo$98b2o2$118bo26b2o$108b2o 8b3o24bo$108bobo10bo21bobo$108bo11b2o15bo5b2o4b2o$136b2o11b2o$109b2o 25bobo$105bo3bo2bo37bo$104bo2bob3o37bobo$104b3obo39bo2bo$98b2o5bob3o 37bo2bo$98b2o11bo$98b2o22b2o23bo2bo$99bo22b2o25b2o$98bobo$97b2obo12b3o $113bo$114bo$98b2o$98b2o57b3o2$131b2o20b3obo2bo$132bo7b2o9bob3o$129b3o 8b2o8bo6b3o$129bo20b2o2$153b2o$145b2o9b2o$145b2o7bobo$101b2o52bo25bo 19b2o$101b2o74b2o2b2ob3o10b2o4b4o$160b2o15b2o4b4o10b2o2b2ob3o$142b2o 15b3o19b2o18bo24b2o$101b3o34b2o2b2o2b2o10bobo2bo2b2o59b2o$102b2o34bobo 2bo2b2o10b2o2b2o2b2o58bo$99b2o38b3o20b2o$89bo9b3o38b2o45b2o9b2o$87bo3b o8bobo83b2obo8b2o$87bo3bo9b2o84bo$87bobobo3bo90bobo$95b2o89b2o4b3o$89b 2o6bo88bob3o3bo$89b2o3bobo91bobo2bo$89b2o3bo90bo2bo$189bo$76b2o12bobo 26bo60b2o$72b2obo2bob2o9b2o26bobo57bobo$72b2o2bo4bo37b2o60bo$77bo$78bo bo20b2o$69bo25b2o4b2o91b2o$69b3o23b2o52b3o42bo$72bo76bo42bobo$71b2o27b 3o47bo41b2o$100b2o81b2o$90b2o11b2o78b2o$90b2o10b3o$101bobo$74bo26b2o$ 72b2o$73b2o$172b2o$173bo$173bobo$89b2o83b2o$89bobo$91bo$91b2o$190b2o$ 191b2o$162b2o26bo$161bobo$160b3o10b2o$80b2o78b2o11b2o$80b2o81b2o$71b2o 41bo47b3o27b2o$70bobo42bo76bo$70bo42b3o52b2o23b3o$69b2o91b2o4b2o25bo$ 162b2o20bobo$187bo$83bo60b2o37bo4bo2b2o$83bobo57bobo26b2o9b2obo2bob2o$ 83b2o60bo26bobo12b2o$75bo$76bo2bo90bo3b2o$71bo2bobo91bobo3b2o$70bo3b3o bo88bo6b2o$70b3o4b2o89b2o$76bobo90bo3bobobo$77bo84b2o9bo3bo$65b2o8bob 2o83bobo8bo3bo$65b2o9b2o45b2o38b3o9bo$101b2o20b3o38b2o$38bo58b2o2b2o2b 2o10b2o2bo2bobo34b2o$36b2o59b2o2bo2bobo10b2o2b2o2b2o34b3o$37b2o24bo18b 2o19b3o15b2o$58b3ob2o2b2o10b4o4b2o15b2o$58b4o4b2o10b3ob2o2b2o74b2o$62b 2o19bo25bo52b2o$108bobo7b2o$107b2o9b2o$110b2o2$113b2o20bo$105b3o6bo8b 2o8b3o$109b3obo9b2o7bo$104bo2bob3o20b2o2$105b3o57b2o$165b2o$150bo$151b o$149b3o12bob2o$164bobo$114b2o25b2o22bo$114bo2bo23b2o22b2o$153bo11b2o$ 114bo2bo37b3obo5b2o$113bo2bo39bob3o$113bobo37b3obo2bo$114bo37bo2bo3bo$ 126bobo25b2o$114b2o11b2o$114b2o4b2o5bo15b2o11bo$119bobo21bo10bobo$119b o24b3o8b2o$118b2o26bo2$165b2o$2bo156b2o4b2o$2o157b2o$b2o$164b2obo$165b obo$166bo$165b2o$165b2o$165b2o20$162bobo$163b2o$163bo34$198bobo$199b2o $199bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 9 THUMBSIZE 2 ZOOM 6 WIDTH 960 HEIGHT 960 GPS 24 AUTOSTART LOOP 144 ]]

The period-144 gunstar (click above to open LifeViewer) RLE: here Plaintext: here

x = 149, y = 149, rule = B3/S23 40b2o$40b2o$40b2o$40bo$39bobo$39bob2o2$46b2o$40b2o4b2o$40b2o$49b2o$48b ob2o8bo26b2o$51bo8b3o24bo$63bo21bobo$62b2o21b2o4b2o$91b2o2$92bo$48b2o 41bobo$47b3o40bo2bo$40b2o5b3ob2o36bo2bo$40b2o3b5ob2o$40b2o7bobo12b2o 23bo2bo$41bo7b3ob3o8b2o25b2o$40bobo10bo$39b2obo11bo3$40b2o$40b2o2$73b 2o22bo$74bo21bobo$71b3o18bob3o3b2o$71bo20bo2bobo2b2o$92b2o5b3o$99bo$ 87b2o11bo$87b2o10b2o$43b2o32bo21bo23bo19b2o$43b2o32bobo39b2o2b2ob3o10b 2o4b4o$77b2o23b2o15b2o4b4o10b2o2b2ob3o$84b2o15b3o19b2o18bo$43b3o34b2o 2b2o2b2o10bobo2bo2b2o$44b2o34bobo2bo2b2o10b2o2b2o2b2o$41b2o38b3o20b2o 21bo$41b3o38b2o43bo12b2o$33b3o6bobo82b3o10b2o$33b3ob2o4b2o82b4o6bo$35b 2ob2o85b6o7bo$32bo92bo11b2o$31bo2bo90b4o7b2o$32b2o93b2o$33b2o89b2o$33b o89bobo$18b2o15bo89bo$14b2obo2bob2o9b3o$14b2o2bo4bo$19bo$20bobo20b2o$ 11bo25b2o4b2o91b2o$11b3o23b2o97bo$14bo119bobo$13b2o27b3o89b2o$42b2o81b 2o$45b2o78b2o$44b3o$43bobo$43b2o$40bo$41bo$39b3o72b2o$115bo$115bobo$ 31b2o83b2o$31bobo$33bo$33b2o72b3o$107bo$108bo$104b2o$103bobo$102b3o$ 22b2o78b2o$22b2o81b2o$13b2o89b3o27b2o$12bobo119bo$12bo97b2o23b3o$11b2o 91b2o4b2o25bo$104b2o20bobo$129bo$125bo4bo2b2o$113b3o9b2obo2bob2o$23bo 89bo15b2o$23bobo89bo$23b2o89b2o$20b2o93b2o$11b2o7b4o90bo2bo$10b2o11bo 92bo$10bo7b6o85b2ob2o$11bo6b4o82b2o4b2ob3o$7b2o10b3o82bobo6b3o$7b2o12b o43b2o38b3o$21bo21b2o20b3o38b2o$39b2o2b2o2b2o10b2o2bo2bobo34b2o$39b2o 2bo2bobo10b2o2b2o2b2o34b3o$5bo18b2o19b3o15b2o$3ob2o2b2o10b4o4b2o15b2o 23b2o$4o4b2o10b3ob2o2b2o39bobo32b2o$4b2o19bo23bo21bo32b2o$48b2o10b2o$ 48bo11b2o$49bo$47b3o5b2o$47b2o2bobo2bo20bo$47b2o3b3obo18b3o$50bobo21bo $51bo22b2o2$107b2o$107b2o3$94bo11bob2o$95bo10bobo$56b2o25b2o8b3ob3o7bo $56bo2bo23b2o12bobo7b2o$96b2ob5o3b2o$56bo2bo36b2ob3o5b2o$55bo2bo40b3o$ 55bobo41b2o$56bo2$56b2o$56b2o4b2o21b2o$61bobo21bo$61bo24b3o8bo$60b2o 26bo8b2obo$98b2o$107b2o$101b2o4b2o$101b2o2$106b2obo$107bobo$108bo$107b 2o$107b2o$107b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 9 THUMBSIZE 2 ZOOM 6 WIDTH 960 HEIGHT 960 GPS 24 ]]

The period-216 gunstar (click above to open LifeViewer) RLE: here Plaintext: here

See also

• Gunstar 2
• New gun 2

External links

• Gunstar at the Life Lexicon
• Buckingham on B-heptominos in oscillators at Paul Callahan's Page of Conway's Life Miscellany